Overview

overview

8

Static

static

8

Engagement Letter.exe

windows10-2004-x64

8

Engagement Letter.exe

windows11-ltsc_2024-x64

8

Sharing

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General

  • Target
    Engagement Letter.exe
  • Size 5.4MB
  • Sample260913-w2xesat1a1
  • SHA256 f657fa48ac44e5d0150c35853372fb4bd1c86c9ccc1fcd716995ab6ca055599d
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
8/10
backdoordiscoverypersistenceprivilege_escalationransomwareratrevoked_codesign

Malware Config

Targets

    • Target
      Engagement Letter.exe
    • Size 5.4MB
    • SHA256 f657fa48ac44e5d0150c35853372fb4bd1c86c9ccc1fcd716995ab6ca055599d
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    8/10
    backdoordiscoverypersistenceprivilege_escalationransomwareratrevoked_codesign

    • Sets service image path in registry

      This determines the executable launched when a service starts. It can be used to establish persistence.

      persistence

    • Signed with revoked ConnectWise certificate

      Binary is signed using a ConnectWise certificate revoked for key compromise.

      revoked_codesign

    • ConnectWise ScreenConnect remote access tool

      ConnectWise ScreenConnect is a remote desktop tool that can be used as a backdoor.

      backdoorrat

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    • Boot or Logon Autostart Execution: Authentication Package

      Suspicious Windows Authentication Registry Modification.

      persistenceprivilege_escalation

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Event Triggered Execution: Component Object Model Hijacking

      Adversaries may establish persistence by executing malicious content triggered by hijacked references to Component Object Model (COM) objects.

      persistenceprivilege_escalation
    behavioral1behavioral2

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

2
T1547

Authentication Package

1
T1547.002

Registry Run Keys / Startup Folder

1
T1547.001

Create or Modify System Process

1
T1543

Windows Service

1
T1543.003

Event Triggered Execution

1
T1546

Component Object Model Hijacking

1
T1546.015

Privilege Escalation

Boot or Logon Autostart Execution

2
T1547

Authentication Package

1
T1547.002

Registry Run Keys / Startup Folder

1
T1547.001

Create or Modify System Process

1
T1543

Windows Service

1
T1543.003

Event Triggered Execution

1
T1546

Component Object Model Hijacking

1
T1546.015

Defense Evasion

Modify Registry

1
T1112

Credential Access

Discovery

Peripheral Device Discovery

2
T1120

Query Registry

3
T1012

System Information Discovery

4
T1082

System Location Discovery

1
T1614

System Language Discovery

1
T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Tasks